component

1SMB5948BT3G

Public Made by Adom

by adom

onsemi Zener Diodes, SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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1SMB5948BT3G

onsemi · Zener Diodes · SMB

1SMB5948BT3G from onsemi, in a SMB. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 Cathode passive Cathode, indicated by the polarity band; for the 1SMB5948B the Zener voltage is 91 V nominal (86.45 V to 95.55 V) at IZT = 4.1 mA.
2 Anode passive Anode terminal of the 3 W Zener diode; maximum steady-state power dissipation is 3.0 W at TL = 75°C.

Key specifications

Parameter Value
Manufacturer onsemi
Package SMB
Category Diodes
Pins 2

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Zener Voltage VZ 86.45 91 95.55 V @ IZT = 4.1 mA, TL = 30°C 3
Zener Test Current IZT 4.1 mA 3
Maximum Zener Impedance ZZT 200 Ω @ IZT = 4.1 mA 3
Maximum Zener Impedance ZZK 3000 Ω @ IZK = 0.25 mA 3
Reverse Leakage Current IR 1 µA @ VR = 69.2 V 3
Maximum DC Zener Current IZM 16 mA 3
Forward Voltage VF 1.5 V IF = 200 mA(dc) 3
Zener Voltage Tolerance -5 5 % Type number indicates tolerance of ±5% 3
Maximum Steady State Power Dissipation PD 3 W @ TL = 75°C, measured at zero lead length 1
Derating above 75°C 40 mW/°C Derate above 75°C 1
Maximum Steady State Power Dissipation PD 550 mW @ TA = 25°C, FR-4 board, recommended footprint 1
Derating above 25°C 4.4 mW/°C Derate above 25°C 1
Operating and Storage Temperature Range TJ, Tstg -65 150 °C 1
Thermal Resistance Junction-to-Lead RθJL 25 °C/W 1
Thermal Resistance Junction-to-Ambient RθJA 226 °C/W FR-4 board, recommended footprint 1

CAD (KiCad official)

  • Symbol: 1SMB5948BT3G
  • Footprint: Diode_SMD:D_SMB
  • 3D model: SMB (KiCad packages3D, STEP)
  • 3D model files: 1smb5948bt3g-etched.step / 1smb5948bt3g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 1smb5948bt3g.step / 1smb5948bt3g.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: onsemi datasheet (6 pp, sha256 e95f4deeabd8ea97, retrieved 2026-10-22, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF